.body_bj{ position:fixed; top:0; left:0; right:0; bottom:0; background:url(../images/code_bj.jpg) 50% 0 no-repeat; background-size:cover;}

.code-boxs{ position:relative; width:80%; max-width:400px; margin:30px auto 20px; text-align:center;}
.code-boxs img{ vertical-align:middle;}
.code-tit{ padding:50px 10px 0; background-color:#fff; border-top-left-radius:20px; border-top-right-radius:20px }
.code-ma{ padding:0 30px 30px; background-color:#fff; border-bottom-left-radius:20px; border-bottom-right-radius:20px; box-shadow:0px 2px 5px rgba(0, 0, 0, 0.2);}